5

したがって、次のような構成を持つConfigurationSection/ConfigurationElementCollectionがあります。

<mimeFormats>
    <add mimeFormat="text/html" />
</mimeFormats>

そして、これがmimeFormatsの処理方法です。

 public class MimeFormatElement: ConfigurationElement
{
    #region Constructors
    /// <summary>
    /// Predefines the valid properties and prepares
    /// the property collection.
    /// </summary>
    static MimeFormatElement()
    {
        // Predefine properties here
        _mimeFormat = new ConfigurationProperty(
            "mimeFormat",
            typeof(MimeFormat),
            "*/*",
            ConfigurationPropertyOptions.IsRequired
        );
    }
    private static ConfigurationProperty _mimeFormat;
    private static ConfigurationPropertyCollection _properties;

    [ConfigurationProperty("mimeFormat", IsRequired = true)]
    public MimeFormat MimeFormat
    {
        get { return (MimeFormat)base[_mimeFormat]; }
    }
}

public class MimeFormat
{
    public string Format
    {
        get
        {
            return Type + "/" + SubType;
        }
    }
    public string Type;
    public string SubType;

    public MimeFormat(string mimeFormatStr)
    {
        var parts = mimeFormatStr.Split('/');
        if (parts.Length != 2)
        {
            throw new Exception("Invalid MimeFormat");
        }

        Type = parts[0];
        SubType = parts[1];
    }
}

そして明らかに、（この空のシェルの代わりに）実際に何かを行うTypeConverterが必要です：

public class MimeFormatConverter : TypeConverter
{
    public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
    {
        throw new NotImplementedException();
    }
    public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
    {
        throw new NotImplementedException();
    }

    public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
    {
        throw new NotImplementedException();
    }
    public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
    {
        throw new NotImplementedException();
    }
}

文字列との間で型変換できるTypeConverterを設定するにはどうすればよいですか？MSDNの例を使用してみましたが、エラーメッセージが表示され続けます。

TypeConverterはSystem.Stringから変換できません。

基本的に、ConfigurationSectionが実行しようとしているものすべてで機能するように設定するにはどうすればよいですか？

4

4 に答える 4

3

これを試して：

TestSection.cs

public class TestSection : ConfigurationSection
{

    private static readonly ConfigurationProperty sFooProperty = new ConfigurationProperty("Foo",
                                                                                          typeof(Foo),
                                                                                          null,
                                                                                          new FooTypeConverter(),
                                                                                          null,
                                                                                          ConfigurationPropertyOptions.None);

    public static readonly ConfigurationPropertyCollection sProperties = new ConfigurationPropertyCollection();

    static TestSection()
    {
        sProperties.Add(sFooProperty);
    }

    public Foo Foo
    {
        get { return (Foo)this[sFooProperty]; }
        set { this[sFooProperty] = value; }
    }

    protected override ConfigurationPropertyCollection Properties
    {
        get { return sProperties; }
    }

}

Foo.cs

public class Foo
{

    public string First { get; set; }
    public string Second { get; set; }

    public override string ToString()
    {
        return First + ',' + Second;
    }

}

FooTypeConverter.cs

public class FooTypeConverter : TypeConverter
{

    public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
    {
        return (sourceType == typeof(string));
    }

    public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
    {
        string val = value as string;

        if (val != null)
        {
            string[] parts = val.Split(',');

            if (parts.Length != 2)
            {
                // Throw an exception
            }

            return new Foo { First = parts[0], Second = parts[1] };
        }

        return null;
    }

    public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
    {
        return (destinationType == typeof(string));
    }

    public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
    {
        Foo val = value as Foo;

        if (val != null)
            return val.ToString();

        return null;
    }

}
于 2011-05-09T17:04:16.173 に答える
1

私はそれを考え出した。解決策は次のとおりです。

public class MimeFormatElement: ConfigurationElement
{
    #region Constructors
    /// <summary>
    /// Predefines the valid properties and prepares
    /// the property collection.
    /// </summary>
    static MimeFormatElement()
    {
        // Predefine properties here
        _mimeFormat = new ConfigurationProperty(
            "mimeFormat",
            typeof(MimeFormat),
            "*/*",
            ConfigurationPropertyOptions.IsRequired
        );

        _properties = new ConfigurationPropertyCollection {
            _mimeFormat, _enabled
        };
    }
    private static ConfigurationProperty _mimeFormat;
    private static ConfigurationPropertyCollection _properties;

    [ConfigurationProperty("mimeFormat", IsRequired = true)]
    public MimeFormat MimeFormat
    {
        get { return (MimeFormat)base[_mimeFormat]; }
    }
}

/*******************************************/
[TypeConverter(typeof(MimeFormatConverter))]
/*******************************************/
public class MimeFormat
{
    public string Format
    {
        get
        {
            return Type + "/" + SubType;
        }
    }
    public string Type;
    public string SubType;

    public MimeFormat(string mimeFormatStr)
    {
        var parts = mimeFormatStr.Split('/');
        if (parts.Length != 2)
        {
            throw new Exception("Invalid MimeFormat");
        }

        Type = parts[0];
        SubType = parts[1];
    }
}

public class MimeFormatConverter : TypeConverter
{
    public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
    {
        return sourceType == typeof(string);
    }
    public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
    {
        return new MimeFormat((string)value);
    }

    public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
    {
        return destinationType == typeof(string);
    }
    public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
    {
        var val = (MimeFormat)value;
        return val.Type + "/" + val.SubType;
    }
}
于 2011-05-09T18:14:05.917 に答える
0

この時点から、ConvertTo メソッドと ConvertFrom メソッド内に変換セクションを作成する必要があります。

public override object ConvertFrom( ITypeDescriptorContext context, CultureInfo culture, object value ) {
  if ( value == null )
    return null;

  try {
    if ( value is string ) {
      string s = (string)value;

      // here is where you look at the string to figure out the MimeFormat
      // like so....
      return new MimeFormat( s );
    }


  throw new NotSupportedException( NotSupportedException( value.GetType(), typeof(MimeFormat) );
}

public override object ConvertTo( ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType ) {
  if ( value == null )
    return null;

  MimeFormat p = (MimeFormat)value;
  if ( destinationType == typeof( String ) )
    return p.ToString();

  throw new NotSupportedException( NotSupportedException( typeof(MimeFormat), destinationType ) );
}

編集済み

CanConvert 関数もオーバーライドする必要があります。

public override bool CanConvertFrom( ITypeDescriptorContext context, Type sourceType ) {
  if ( sourceType == typeof( string ) )
    return true;
  return false;
}

public override bool CanConvertTo( ITypeDescriptorContext context, Type destinationType ) {
  if ( destinationType == typeof( string ) )
    return true;
  return false;
}
于 2011-05-09T16:59:24.753 に答える